Speed reducer apparatus



FIG. 1 is a perspective view of a speed reducer apparatus showing our new design;

FIG. 2 is a side view taken from the right of FIG. 1, the side opposite being a mirror image thereof;

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof. 

The ornamental design for a speed reducer apparatus, as shown. 